Spindle-tightener



J. MATTSON.

SPINDLE TIGHTENER.

APPLICATION FILED MAR. 16.:92l.

1,401,270. at nted Dec. 27, 1921 INVENTOR A TTORNEYS PATENT OFFICE.

JULIUS MATTSON, OF CHICAGO, ILLINOIS.

SPINDLE-TIGHTENER.

Application filed March 16, 1921. Serial No. 452,726.

To all whom it may concern:

Be it known that I JULIUS Mm'rson, a

citizen of the United tates, and a resident of Chica 0, in the county ofCook and State of Illinois, have invented a new and useful 1m rovementin Spindle-Tighteners, of which the following is a full, clear, andexact description.

My invention relates to improvements in devices for tightening spindlesand more particularly to devices for holding driven spindles in millingmachines, or the like, against longitudinal movement, and it consists inthe combinations, constructions and arrangements herein described andclaimed.

An object of my invention is to provide a device having means forengaging with a spindle to adjust the latter relative to its bearingsand to prevent longitudinal movement of the spindle without interferingwith the functional movements thereof.

A further object of my invention is to provide a device of the characterdescribed that is self-adjusting in that it has means for preventingplay between relatively moving parts on accountof wear on such parts.

A further object of my invention is to provide a device of thecharacterdescribed that is simple in construction and operation,

not likely to get out of order easily, and thoroughly practicalcommercially.

A further object of my invention is to provide a device of the characterdescribed that can be applied to milling machines and the like ofordinary construction without extensive changes in the usualconstruction bein necessary.

Tlther objects and advantages will appear in the followin specification,and the novel features of the invention will be particularly pointed outin the appended claims.

My invention is illustrated in the accompanying drawings, forming partof this application, in which- Figure 1 is a longitudinal sectionthrough a portion of a milling machine to which the device is applied,

Fig. 2 is a section along the line 2-2 of Fi ig. 3 is a section alongthe line 3-3 of Fig 1, and,

ig. 4 is an end view of a portion of the device, a portion thereof beingbroken away.

Referring now to the drawings, 1 denotes Specification of LettersPatent.

Patented Dec. 27, 1921.

a milling machine bed supporting a frame Qd'ItLVIIIg integral spacedapart parallel upright arms 3 and 4. The arm 3 is formed with an opening5 having disposed therein a bushing 6 in which is rotatably mounted theenlarged portion 7 of a hollow shaft or spindle 8. The latter isarranged with its remote end portion disposed in a bushing 9 secured inan opening 10 in the arm 1 and with its adjacent end portion extendingbeyond the corresponding end of the bushing 6 and threaded at 11 forengagement with a cutter 12. It is to be observed that the opening 10and the opening 5 have their centers alined so that the shaft 8 ishorizontally disposed. The ends of the bushing 9 extend beyond thecorresponding sides of the frame 4 and the inner end of the bushing 6likewise extends beyond the correspondim side of the arm 3.

A collar 18 is mounted on the shaft 8 and rigidly secured thereto at aspaced distance from the adjacent or inner end of the bushing 6 by pins14, or the like. The peripheral wall of thecollar 13 is threaded andscrewed thereon in an outer collar 15 that is split as shown best inFig. 2 and is positioned with respect to the axis of the 1 low shaft 19that is disposed in the bore 20 of the main hollow shaft or spindle 8and is concentric therewith. The collar 18 is positioned to contact withthe adjacent or inner end of the bushing 9 and its movement along thespindle 8 toward the arm 3 is limited by a collar 21 mounted on thespindle 8 and secured thereto by pins 22, or the like, so that a portionthereof extends slightly beyond theadjacent ends of the slots 16-16.

The auxiliary shaft 19, which is in effect a thrust rod, as will behereinafter pointed out, projects beyond the adjacent end of the spindle8 and has slidably mounted thereon a disk 23 that has a diameter equalto that of the spindle 8, or possibly slightly less, and is arranged toabut the end of the adjusted position.

spindle. The shaft 19 is threaded exteriorly at 24; and has screwedthereon an adjusting disk 25 that is split radially as shown in l. Acompression spring 26 is disposed on the shaft 19 so that the endsthereof react against the disk 23 and the adjusting disk 25,respectively.

From the foregoing description of the various parts the device, theoperation thereof may be readily understood. The

split collar is urned on the inner collar 13 and as the former contactswith the bearing 6, it is obvious that the spindle 8 will be movedlongitudinally until the collar 18 other of the spindle has beencontacted by the fixed collar 21 and moved against the bushing 9. Thespindle 8 will thus be ti ;htened so that the cutter 12 will be inposition to engage work 2? without trictionally contacting the frame 3or he bushing 6. l Vhen the spindle 8 has been aoved into determined oradjusted position '0 that it is held ag nstlongitudinal move- -nent, thecollar 15 is locked in adjusted po sition relative to the inner collar13. This is preferably accomplished by means of an expansion screw orbolt comprising an exteriorly threaded headed tubular member 28 splitfrom its end longitu inally, as at 29, and screwed into registerinthreaded openings 30 and 81 extending through the end portions of thesplit collar 15 at right angles to the ends thereof, thereby drawing theends together to lock the collar to the inner collar 13. tapering screw32 is screwed into the it end portion of the tubular member 98 that isthi aded interiorly for the reception thereof to expand the splitportion of the tubular member and thus lock the latter in its adjustedposition.

When the spindle 8 has been secured in adjusted position in the mannerdescribed, the means for preventing play between the spindle and t 1ehereinbet'ore described memhers that prevent lon itudinal movementthereof is adjusted. This is effected by screwing the adjusting disk 25on the shaft to a desired position, thereby increasing the tension onthe spring 26 and forcing the disk 28 firmly the end of the spindle 8.The adjusting disl 25 is then looked in aojusted position by anexpansion screw or belt that is identical in essential respects with thee" ansion screw or bolt that has been described as looking the collar 15The parts of the expansion screw engaging the threaded openings andlethrough the end portions of the split disl: 25 have therefore beenindicated by the same reference numerals as the lilgte parts thehcreinbefore described expansion sore-i. it is obvious that the reactionof the spring 26 against the disk 23 and the adjusting disk 25 willthrust the spindle 8 in the direction of the arm 3, thereby maintainingthe collar 15 against the bushing 6 and at the same time ll thrust theadjusting disk 25 in the opposite dircc tion, thereby maintaining thecollar 15% against the bushing 9, thus preventing play gitudinalmovement without interfering with the free functional movement thereof.

I claim:

1. The combination with a hollow driven spindle supported for rotationin separated bearings of a collar rigidly mounted on the spindleadjacent to one of said bearings and having its peripheral wallthreaded, a slidable collar disposed on the spindle adjacent to theother bearing of the spindle, diametrically opposed guide pins havingtheir outer ends fast in the inner wall of the slidable collar andhaving their inner ends projecting through guide slots through the wallsol. the spindle adjacent to its second named bearing, a collar rigidlymounted on the spindle at a determined distance from the second namedbearing to limit the movement of the slidable collar in the direction ofthe first named bearing, an adjusting collar screwing on the first namedcollar and operable to contact with the first named bearing to occasiona movement of the spindle in the direction of the scond named bearing,whereby the slidablc collar will be held against the second namedbearing and said spindle will be held against longitudinal movementrelative to its bearings, and means connecting with the guide pins andexerting a thrust against the end of the spindle adjacent to the secondnamed bearing for preventing play between said adjusting collar and thefirst named bearing and between said slidable collar and the secondnamed bearing on account of wear on the parts.

2. The combination with a hollow driven spindle slidably and rotatablysupported adjacent to its ends in separated bearings of means foradjusting initially the position oi the spindle with respect to itsbearings and for preventing movement of said spindle toward one of saidbearings, a slidable collar d sposed on the spindle adjacent to itsother bearing, a guide pin secured to the slidable collar and projectedthrough :1 guide slot in the wall of the spindle, means for limiting themovement of the slidable collar toward the first named bearing, andmeans connecting with the guide pin and exerting a thrust against theend or the spindle udjacent to the second named bearin lor preventingplay between the adjusting means and the first named bearing and betweenthe collar and the second named bearing on account of wear on the parts.

3. The combination with a slidably and rotatably supported hollowspindle having a guide slot through its Walls adjacent to its support,or a slidable collar disposed on the spindle, a guide pin secured tosaid collar and arranged to proiect into the inner bore of the spindle,means connecting with the guide pin and engaging the spindle at oneJULIUS MATTSON.

